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   <div id="projectname">gbmath
   &#160;<span id="projectnumber">v0.051</span>
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   <div id="projectbrief">c++ math library</div>
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<div class="title">arc_ball.h</div>  </div>
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<a href="arc__ball_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;</div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="preprocessor">#pragma once</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#ifdef WIN32  // only for windows platform</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="keyword">namespace </span>gbmath</div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;{</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;</div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;</div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;    <span class="keyword">class </span>arc_ball  </div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;    {</div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;    <span class="keyword">public</span>:</div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;        arc_ball(<span class="keywordtype">bool</span> cameraLeftHandle=<span class="keyword">true</span>);</div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;        <span class="keywordtype">void</span> reset(); </div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;        <span class="keywordtype">void</span> setTranslationRadius( <span class="keywordtype">float</span> fRadiusTranslation ) </div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;        { </div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;            m_fRadiusTranslation = fRadiusTranslation; </div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        }</div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;        <span class="keywordtype">void</span> setWindow( INT nWidth, INT nHeight, <span class="keywordtype">float</span> fRadius = 0.9f ) </div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;        { </div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;            m_nWidth = nWidth; </div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;            m_nHeight = nHeight; </div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;            m_fRadius = fRadius; </div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;            m_vCenter = vec2(m_nWidth/2.0f,m_nHeight/2.0f); </div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;        }</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;        <span class="keywordtype">void</span> setOffset( INT nX, INT nY ) </div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        { </div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;            m_Offset.x = nX; </div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;            m_Offset.y = nY; </div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;        }</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        <span class="keywordtype">void</span> onBegin( <span class="keywordtype">int</span> nX, <span class="keywordtype">int</span> nY );  <span class="comment">// start the rotation (pass current mouse position)</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;        <span class="keywordtype">void</span> onMove( <span class="keywordtype">int</span> nX, <span class="keywordtype">int</span> nY );   <span class="comment">// continue the rotation (pass current mouse position)</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="keywordtype">void</span> onEnd();                    <span class="comment">// end the rotation </span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;        LRESULT     handleMessages( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;        <span class="keyword">const</span> mat44&amp; getRotationMatrix()                   </div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        { </div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;              m_mRotation.setRotationQuaternion(m_qNow);</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;              <span class="keywordflow">return</span> m_mRotation;</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;        }</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;        <span class="keyword">const</span> mat44&amp; getTranslationMatrix()<span class="keyword"> const          </span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="keyword">        </span>{ </div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            <span class="keywordflow">return</span> m_mTranslation; </div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;        }</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        <span class="keyword">const</span> mat44&amp; getTranslationDeltaMatrix()<span class="keyword"> const     </span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="keyword">        </span>{ </div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;            <span class="keywordflow">return</span> m_mTranslationDelta; </div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        }</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        <span class="keywordtype">bool</span>        isBeingDragged()<span class="keyword"> const </span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="keyword">        </span>{ </div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;            <span class="keywordflow">return</span> m_bDrag; </div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;        }</div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;        Quaternion getQuatNow()<span class="keyword"> const  </span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="keyword">        </span>{ </div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;            <span class="keywordflow">return</span> m_qNow; </div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;        }</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;        <span class="keywordtype">void</span>        setQuatNow( Quaternion q ) </div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;        { </div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;            m_qNow = q; </div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;        }</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;        <span class="keyword">static</span> Quaternion quatFromBallPoints( <span class="keyword">const</span> vec3 &amp;vFrom, </div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;                                                    <span class="keyword">const</span> vec3 &amp;vTo, <span class="keywordtype">bool</span> leftHandle=<span class="keyword">true</span> );</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <span class="keyword">protected</span>:</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;        <span class="keyword">const</span> <span class="keywordtype">bool</span> m_bArcBallLeftHandle;</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;        mat44  m_mRotation;         </div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;        mat44  m_mTranslation;      </div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;        mat44  m_mTranslationDelta; </div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;        POINT          m_Offset;   </div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;        INT            m_nWidth;   </div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;        INT            m_nHeight;  </div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;        vec2    m_vCenter;  </div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;        <span class="keywordtype">float</span>          m_fRadius;  </div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;        <span class="keywordtype">float</span>          m_fRadiusTranslation; </div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;        Quaternion m_qDown;             </div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;        Quaternion m_qNow;              </div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;        <span class="keywordtype">bool</span>           m_bDrag;             </div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;        POINT          m_ptLastMouse;      </div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;        vec3    m_vDownPt;           </div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;        vec3    m_vCurrentPt;        </div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;        vec3    screenToVector( <span class="keywordtype">float</span> fScreenPtX, <span class="keywordtype">float</span> fScreenPtY );</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;    };</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;}</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="preprocessor">#endif  // win32</span></div>
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